Would be having a good look at wires going across the back of trunk, that go to right side lamp. Turn signal and brake lamp usually use the same wire
from the turn signal switch to the back of car, so would be looking at wiring coming out of turn signal switch for power with brake pedal pressed. Looks to be a dark green wire that feeds the right turn and brake lamps, it comes out at bottom of column.
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64 Lemans hardtop
4spd, buckets
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